package com.wc.AlgoOJ_homework.AlgoOJ_test5.D_非自然语言处理;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

/**
 * @Author congge
 * @Date 2024/3/18 19:30
 * @description http://43.138.190.70:8888/p/1018?tid=65f4f2f02337f3a932b4945c
 */
public class Main {
    static FastReader sc = new FastReader();
    static PrintWriter out = new PrintWriter(System.out);
    static int N = 200010;
    static char[] s = new char[N];
    static char[] cv = new char[N];
    static int t, n;

    public static void main(String[] args) {
        t = sc.nextInt();
        while (t-- > 0) {
            n = sc.nextInt();
            s = (" " + sc.next()).toCharArray();
            for (int i = 1; i <= n; i++) {
                if (s[i] == 'a' || s[i] == 'e') {
                    cv[i] = 'v';
                } else {
                    cv[i] = 'c';
                }
            }
            cv[n + 1] = 'c';
            boolean first = false;
            char pre = 'c';
            for (int i = 1; i <= n; i++) {
                if (cv[i] == 'v') {
                    out.print(s[i]);
                } else {
                    if (pre == 'c') {
                        if (first) {
                            out.print('.');
                        }
                        out.print(s[i]);
                        first = true;
                    } else {
                        if (cv[i + 1] == 'c') {
                            out.print(s[i]);
                        } else {
                            if (first) {
                                out.print('.');
                            }
                            out.print(s[i]);
                            first = true;
                        }
                    }
                }
                pre = cv[i];
            }
            out.println();
        }
        out.flush();
    }
}

class FastReader {
    StringTokenizer st;
    BufferedReader br;

    FastReader() {
        br = new BufferedReader(new InputStreamReader(System.in));
    }

    String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }

    int nextInt() {
        return Integer.parseInt(next());
    }

    String nextLine() {
        String s = "";
        try {
            s = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return s;
    }

    long nextLong() {
        return Long.parseLong(next());
    }

    double nextDouble() {
        return Double.parseDouble(next());
    }

    // 是否由下一个
    boolean hasNext() {
        while (st == null || !st.hasMoreTokens()) {
            try {
                String line = br.readLine();
                if (line == null)
                    return false;
                st = new StringTokenizer(line);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return true;
    }
}